luther king jr.'s birthday. >> earlier 25today, president obama and vice president biden traveled to the martin luther king jr. monument. >> mother person who was sut cut down. medger evers was shot. and you're the first lay woman, usually it's clergy who gives the invocation, they've told you three minutes does that make you anxious? >> three minutes. no, it doesn't. first of all, i'm just thrilled. i'm so honored to have been asked to deliver the invocation. to get it down to three minutes is going to be a little difficult for me. but i've gone through it and i think i will be successful. if not, perhaps they'll turn the mike off. i don't know. >> they'll play music loud and someone will haul you off the stage. ironically, it was 50 years ago that you were trying to get to the march on washington. >> that is correct. >> and you obviously could not. >> i was in boston, and had just delivered a speech there. transportation was slow. i got to washington and could not get to the stage. it was so disappo